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Intelligent
location-dimensioning of cylindrical surfaces in mechanical parts
Computer-Aided Design
Volume 34, Issue 3, March 2002, Pages 185-194
注意：本文已经在英文CAD杂志发表，使用者请注明出处！
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K. -Z. Chen (a) X. -A. Feng
(b) and Q. -S. Lu(b)
a
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam
Road, Hong Kong
b Faculty of Mechanical Engineering, Dalian University of Technology,
Dalian 116024, China
Abstract
This paper presents an intelligent dimensioning approach to generate location-dimensions
of the cylindrical surfaces in mechanical parts, for their two-dimensional
drawing automatically from their three-dimensional part models based on
feature extraction. The key issues include the strategies and methods
to establish an order of priorities for location-dimensioning of the cylindrical
surfaces in mechanical parts, to eliminate their location-dimension redundancy,
to determine location-dimensioning scheme, to assign the necessary
location-dimensions to suitable views, and to locate them in reasonable
positions for each view using artificial intelligent techniques. Based
on the approach, a corresponding software prototype was developed. Finally,
it is demonstrated, from an example of location-dimensioning, that the
location-dimensions of all the holes in the multi-spindle headstock of
a modular machine tool, were generated successfully using this intelligent
dimensioning software prototype.
Keywords: Intelligent CAD; Dimensioning; Feature extraction; Expert
system
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Article Outline
1. Introduction
2. Elements and workflow of intelligent location-dimensioning for holes
3. Order of priorities for location-dimensioning of holes
3.1. Establishing the order of priorities for location-dimensioning of
holes
3.2. Establishing the order of priorities for location-dimensioning of
hole-pairs with the same priority value
4. Eliminating location-dimension redundancy
4.1. Location-dimension redundancy
4.2. Dimensioning feature vector of holes
4.3. Strategies and methods for eliminating the location-dimension redundancy
4.3.1. Hole A and Hole B are not fixed
4.3.2. Hole A is fixed but Hole B is not fixed
4.3.3. Hole A is not fixed but Hole B is fixed
5. Typical location-dimensioning schemes for holes
5.1. Typical location-dimensioning schemes for the holes with transmission
relationships
5.2. Typical location-dimensioning schemes for the holes lying on a same
circle
5.3. Typical location-dimensioning schemes for the holes lying on the
same straight line
6. Process of determining location-dimensioning scheme for holes
7. Positioning location-dimensions for holes
7.1. Rules of positioning location-dimensions
7.2. Forbidden zones
7.3. Methods of positioning the location-dimensions
8. An example of location-dimensioning for holes
9. Conclusions
References
Vitae
References
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Chen:
Ke-Zhang Chen received his PhD degree from the University of Manchester
(UMIST), UK in 1984. After he had worked at UMIST (UK), East China University
(China), MIT (USA), and University of California at Davis (USA), he joined
the Department of Mechanical Engineering at the University of Hong Kong
in 1996. His current research interests include design theory and methodology,
concurrent engineering, intelligent CAD, distributed design, and design
for heterogeneous components.
Feng:
Xin-An Feng received his BS degree from the Department of Mechanical Engineering,
Dalian University of Techology, China, in 1956. Since then, he has worked
at the University, and is now a professor, deputy director of CIMS research
centre, standing council member of China Association for Mechatronics
Technology and Applications, and standing council member of China Institution
for Production Engineering. His current research interests include CAD/CAM,
intelligent CAD, concurrent engineering, and CIMS.
Lu: Quan-Sheng Lu received his PhD degree from the Department of Mechanical
Engineering, Dalian University of Technology, China, in 1995. He is currently
a research associate and deputy director of international training center
for mould and die in Dalian, China. His main research interest is CAD
for injection mould. 
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